A tornado of smoke created by inhaling smoke from a pipe, joint, etc., exhaling it onto a flat surface in a room with no air circulating, and lifting your hand swiftly, vertically through the smoke (like a reverse karate chop) from the surface. If you do it right, at least one toke-nado is formed.

BMO Chop! Woooooah mayne, I blew out so much smoke on the table, my toke-nado looked like a tiny hurricane. Yay weed!